Shelly, You'd be surprised about what can be found in your drinking water at any given time...
Bettas aren't particularly prone to SBD (you see it more in fancy, round bodied goldfish) but I'd imagine they could get it too. If I were in your situation, honestly, I'd leave the fish in the tank, turn off the tank light (if its on), keep your room dimly lit and don't feed them for a few days. They sound super stressed, likely because, as mentioned before, your tank isn't cycled. When I set my tank back up, I let it cycle for an entire month before adding fish, and I'd treated and seeded the water and used a filter pad that had come out of an established tank. I still used cheap feeder goldies as guinea pigs at first.
Allowing the tank to cycle is the absolute most important thing you can do for your new fish.
Try to reduce stress for the fish as much as possible. At this point, I wouldn't even remove them to fresh water or to dip them, you'll just be stressing them even more. I hope you don't loose them, but please prepare yourself for the worst case scenario and don't get too discouraged.
And on that note, I found one of my Sakura shrimp dead today. It had somehow managed to get itself stuck between a couple of the marbles on the bottom of the tank
I've removed the marbles and added some fine gravel. Hopefully I didn't kill too many of the shrimp fry in the process Edited by howfunkyisurchicken - 1/17/16 at 1:44pm